Altimeter setting

A pressure datum which when set on the sub-scale of a sensitive altimeter causes the altimeter to indicate vertical displacement from that datum. A pressure-type altimeter calibrated in accordance with standard atmosphere may be used to indicate altitude, height or flight levels, as follows:

  • when set to QNH or Area QNH it will indicate altitude
  • when set to standard pressure (1013.2 HPa) it may be used to indicate flight levels.
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